Worksheet 465 · Skill 5

Set and drift

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1. At 1050 your fix is 056°T, 3.3 nm from Heron Point Light. You steer 105°T at 4.2 kn through the water. At 1215 a new fix puts you 149°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1215 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0930 your fix is 096°T, 3.2 nm from Westfield church spire. You steer 134°T at 5.9 kn through the water. At 1020 a new fix puts you 027°T, 1.9 nm from Mill stack.

   Plot the 1020 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0900 your fix is 144°T, 1.6 nm from Westfield church spire. You steer 043°T at 6.0 kn through the water. At 0935 a new fix puts you 283°T, 3.3 nm from Tern Island tower.

   Plot the 0935 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1150 your fix is 052°T, 3.8 nm from Tern Island tower. You steer 264°T at 4.0 kn through the water. At 1225 a new fix puts you 038°T, 1.8 nm from Tern Island tower.

   Plot the 1225 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0720 your fix is 016°T, 3.4 nm from Westfield church spire. You steer 151°T at 4.4 kn through the water. At 0810 a new fix puts you 020°T, 2.9 nm from Heron Point Light.

   Plot the 0810 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1050 your fix is 118°T, 1.1 nm from Gannet Rock daybeacon. You steer 123°T at 4.5 kn through the water. At 1125 a new fix puts you 036°T, 2.5 nm from Kittle water tank.

   Plot the 1125 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1150 your fix is 008°T, 2.3 nm from Heron Point Light. You steer 108°T at 4.7 kn through the water. At 1245 a new fix puts you 328°T, 1.8 nm from Mill stack.

   Plot the 1245 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0930 your fix is 033°T, 2.8 nm from Tern Island tower. You steer 150°T at 4.6 kn through the water. At 1020 a new fix puts you 094°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1020 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn